Measure Guideline: Hybrid Foundation Insulation Retrofits

Research output: NRELSubcontract Report


This measure guideline provides recommendations for designs and variations for retrofit hybrid assemblies in improving interior foundation insulation and water management of basements. Variations include closed cell spray foam (ccSPF) with membrane waterproofing or air gap membrane drainage layers, rigid board foam insulation at flat walls (cast concrete or CMU block), a 'partial drainage' detailmaking use of the bulk water drainage that occurs through the field of a rubble stone wall, and non-drained spray foam assemblies (including slab insulation).
Original languageAmerican English
Number of pages83
StatePublished - 2012

Bibliographical note

Work performed by Building Science Corporation (BSC), Somerville, Massachusetts

NREL Publication Number

  • NREL/SR-5500-54208

Other Report Number

  • DOE/GO-102012-3637


  • basement
  • BSC
  • foundation
  • insulation
  • water management


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